Steam-boiler.



PATENTED JAN. 30, 1906.

G. MARSHALL. STEAM BOILER.

APPLICATION FILED snrw. 5. 1905.

3 SHEETS-SHEET 1.

ram/M PATENTED JAN. 30, 1906.

G. MARSHALL. STEAM BOILER. APPLmu IoN FILED SEPT. 5, 1905.

No. 811,236. PATBNTED JAN. 30, 1906.

- G. MARSHALL.

STEAM BOILER. APPLICATION FILED SEPT. 5. 1905.

3 SHEETS-SHEET 3.

a "ling-w! GEORGE MARSHALL, OF FREMONT, NEBRASKA.

STEAM-BOILER.

Specification of Letters Patent.

Patented J an. 30, 1966.

Application filed iieptember 5,1905. Serial No. 276,992.

To all whom it Worry concern:

Be it known that I, GEORGE MARSHALL, a citizen of the United States, residing at Fremont, in the county of Dodge and State of Nebraska, have invented certain new and useful Improvements in Steam-Boilers, of which the following is a specification.

My invention relates to steam-boilers of the class in which fire-tubes which pass horizontally through the boiler are connected at their ends to the boiler-heads; and the principal object of my invention is to provide a strong and durable connection between the tubes and boiler-heads to protect these joints and to prevent leakage. In my application for patent,filed June 12, 1905, Serial No. 264,827, I have shown a boiler constructed to carry out these general objects but by my present improvements I simplify the construction of some of the parts, make them more efficient, and more easily put together and taken apart.

The ends of the fire-tubes in my improved boiler are connected to the boiler-heads in the usual way, and to the rear head next the firebox I attach a protecting-plate of improved construction. This plate is preferably made in four sections, so that it may be more easily applied to the boiler and in order that only one section need be taken down when repairing some defective flues. Each section of the plate is formed with. holes registering with the tubes and with annular flanges around the holes adapted to register with and be calked to the annular beaded ends of the tubes outside the tube-sheet. The plate is bolted to the tube-sheet and may, if desired, be calked all around its edge. Preferably the plate is made infour sections, as above stated, and the joints of the sections are covered by metallic strips, which are also bolted to the tube-sheet and are preferably calked to the plates. As an additional protection I cover the plate with a protecting-wall constructed of sectional tiles so formed as to be easily put together and taken apart and which may be readily secured to the protecting-plate or de tached therefrom. Preferably the protectingwall is made in four sections and formed with flanges that cover the edges of the plate. The wall has holes registering with the holes in the plate and the tubes, and it has recesses to receive some of the bolts which attach the plate to the tube-sheet. These bolts are empjoyed for holding the protecting wall in p ace.

Inthe accompanying drawings, Figure 1 shows a vertical section of a portion of a steam-boiler with my improvements applied, the section being taken on the line 1 1 of Fig. 2. Fig. 2 is an end elevation thereof. Fig. 8 shows an end elevation with one section of the protecting-wall removed. Fig. 41 is a perspective view looking at the under side of one of the wall-sections. Fig. 5 is a detail view, on an enlarged scale, looking at the front of a portion of one of the protecting-plates. Fig. 6 shows a section on the line 6 6 of Fig. 5. Fig. 7 is an enlarged sectional view showing the connections between the tube-sheet, a tube, and the protecting-plate. Fig. Sis a perspective view of one of the strips employed for connecting the sections of the protectingplate to the tube-sheet. Fig. 9 is a front elevation of the protecting-plate with the connecting-strips applied. Fig. 10 is an enlarged sectional view showing the manner of connecting the tube-sheet, the iirotectingplate, and the protecting-wall. Fig. 11 is a perspective view of one of the filling-rings.

The boiler A,-'fire-tubes B, and boiler-head or tube-sheet C are of usual construction. The fire-tubes have their ends projecting through the head C and spun over or beaded, as indicated at 00. The boiler-head may be calked at 0 around the tubes, as indicated in Fig. 7. While this connection is quite efficient, it often permits leakage, owing to eX- pansion and contraction of metal next to the fire-box. In order to prevent this, I employ a protecting-plate D, which is made of comparatively thick metal and is secured by bolts E to the boilerhead. Preferably I.

make this plate in four sections, as indicated in Fig. 9, in order that it may be more conveniently applied and that when it is necessary to repair any of the joints of thetubes of the boiler-head only a portion of the plate need be removed. This plate may be calked all around its edge, and preferably the oints between the plates are covered by strips F, which are applied as indicated in Fig. 9, being bolted to the boiler-head and held firmly against the plate sections. These strips may be calked to the plate in the manner indicated at f in Fig. 10. The plate-sections are formed with holes or openings G, registering with the holes in. the t'ube-sheet. Each of these holes is formed with an annular flange g, which produces an annular recess g, adapted to fit over the beaded end 00 of the tube in the manner indicated in Fig. 7. It will be observed that the outer end of the hole G is somewhat larger than the hole in the tube-sheet or boiler-head and that the metal to form the flange g is turned down from the metal taken from the plate to form the enlarged opening. The recess g is made to approximately fit the beaded-end of the tube; but as a close fit cannot always be obtained the flange g is calked down into close engagement with the bead of the tubeby a suitable tool. In this way a secure connection is effected and danger of leakage avoided. After the flanges 9 have been made to engage the beaded ends of the tubes filling-rings M are placed in the recesses in front of the flanges. This protectingplate is very eflicient without the use of further protecting means; but I prefer to employ also a protecting-wall H, composed of fire-brick or tile. This protecting-wall is made in sections, so that it may be easily set up or taken apart, and it is formed with flanges h, that overlap the edges of the protecting-plate. Each section of the protecting-wall is formed with a number of holes I, registering with the holes in the protectingplate and the tubes and it is formed also with recesses J to receive the heads of the bolts that secure the plate to the boiler-head. Some of the bolts E are eX- tended in the manner indicated in Fig. 10

and pass into recesses K in the outer faces of the wallsections. These recesses receive nuts 7r. In this manner the wall-sections are held firmly in place. After they are set up the recesses K may be filled with paste or mortar, and the joints between the sections may be filled with paste or mortar, so that the front face of the wall will appear without joint, as indicated in Fig. 2. Preferably the protecting-wall presses closely against the filling-rings M and holds them against the flanges g.

sinese A steam-boiler thus constructed is strong and durable and will stand great heat without deterioration or leakage, and the parts may be easily assembled or taken apart.

I claim as my invention- 1. The combination of a boiler-head, firetubes projecting through the head and beaded on their outer ends, a protectingplate having holes registering with the tubes which is formed with flanges containing grooves to receive the beaded ends of the tubes.

2. The combination of a boilerhead, firetubes attached thereto, a protecting-plate made in sections having holes registering with the tubes and secured to the boilerhead, and metallic strips covering the oints between the sections in the front face of the plate.

3. The combination of a steam-boiler, a protectingplate attached to one of the boiler-heads, a protecting-wall covering the outer face of the protecting-plate and having recesses in its inner and outer faces, headed bolts securing the protecting-plate to the boiler-head having their heads in theinner recesses of the protecting-plate, and headed bolts securing the protecting-wall to the protecting-plate, having nuts arranged in the recesses in the outer face of the protecting-wall.

- 4. The combination, of 'a boiler-head, firetubes projecting through the boiler-head and beaded on their outer ends, a protectingplate having holes registering with the tubes, flanges around these holes engaging the beads and fllling-rings in front of the flanges.

In testimony whereof I have hereunto subscribed my name.

GEORGE MARSHALL.

Witnesses:

S. S. SIDNER, VANARDA KURTZ. 

